You must prepare an HD for the OS you are going to load on to it. This preparation is called formatting. Depending on the OS, you must use the correct formatting.
The system disk is the partition from which the operating system was loaded at startup.
bootdisk.com........you can get it from here
In the Add/Remove Programs icon is a tab called Startup Disk, click the tab
press on startup to display the bootable disks.
It is checking to see if a bootable disk (i.e. windows startup disk) is inserted. Obviously, if it didn't check + your computer didn't work then you wouldn't be able to use your startup disk.
Yes
It can help you recover from a failed boot.
A folder with a stop sign icon on Mac computers indicates that the system is unable to locate the startup disk or that the disk is not functioning correctly. This may occur due to hardware issues, problems with the operating system, or if the startup disk is not properly set. To resolve this, users can restart the computer and hold down the Option key to select a different startup disk or troubleshoot the disk's health. If the issue persists, further diagnosis or repairs may be necessary.
The only BAT (Batch) file on a startup disk is AUTOEXEC.BAT (Auto-Execute). And that's not even mandatory. The AUTOEXEC.BAT runs DOS commands after the command interpreter is loaded.
Four
You must have IO.sys, Msdos.sys and command.com
partition the disk